<template>
    <div>
        <!-- 顶部滑动条区域 -->
        <div id="slider" class="mui-slider">
			<div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
				<div class="mui-scroll">
					<a :class="[mui-control-item, item.id == 0 ? 'mui-active' : '']" 
                    v-for="item in cates" :key="item.id" @tap="getPhotoListByCateId(item.id)">
							{{ item.title }}
					</a>
					
				</div>
			</div>
		</div>

        <!-- 图片列表区域 -->
        <ul class="photo-list">
            <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/' + item.id" tag="li">
                <img v-lazy="item.img_url">
                <div class="info">
                    <h1 class="info-title">{{ item.title }}</h1>
                    <div class="info-body">{{ item.zhaiyao }}</div>
                </div>
            </router-link>
         </ul>

    </div>

    

</template>

<script>
// 1. 导入 mui 的js文件
import mui from '../../lib/mui/js/mui.min.js'


export default {
    data() {
        return {
            cates: [],  // 所有分类的数组
            list: []  // 图片列表的数组
        }
    },
    created() {
        this.getAllCategory();
        // 默认进入页面，就主动请求所有图片列表的数据
        this.getPhotoListByCateId(0);
    },
    mounted() { // 当组件中的DOM结构被渲染好并放到页面中后，会执行这个钩子函数
        // 2. 初始化滑动控件
        mui('.mui-scroll-wrapper').scroll({
            deceleration: 0.0005 // flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
});
    },
    methods: {
        getAllCategory() {
            // 获取所有的图片分类
            this.$http.get('api/getimgcategory').then(result => {
                if (result.body.status === 0) {
                    // 手动拼接出一个最完整的 分类列表
                    result.body.message.unshift({ title: "全部", id: 0 });
                    this.cates = result.body.message;
                }
            });
        },
        getPhotoListByCateId(cateId) {
            // 根据分类 ID , 获取图片列表 
            this.$http.get("api/getimages/" + cateId).then(result => {
                if (result.body.status === 0) {
                    this.list = result.body.message;
                }
            });
        }
    }
}
</script>


<style lang="scss" scoped>
* {
    touch-action: pan-y;
}

img[lazy=loading] {
    width: 40px;
    height: 300px;
    margin: auto;
}
.photo-list {
    list-style: none;
    margin: 0;
    padding: 10px;
    padding-bottom: 0;
    li {
        background-color: #ccc;
        text-align: center;
        margin-bottom: 10px;
        box-shadow: 0 0 9px #999;
        position: relative;
        img {
            width: 100%;
            vertical-align: middle;
        }
        img[lazy=loading] {
        width: 40px;
        height: 300px;
        margin: auto;
        }

        .info {
            color: #ccc;
            text-align: left;
            position: absolute;
            bottom: 0;
            background-color: rgba(0, 0, 0, 0.4);
            max-height: 84px;
            .info-title {
                font-size: 14px;
            }
            .info-body {
                font-size: 13px;
            }
        }

        
    }
}
</style>

